Survey Of Practices In Controlling Roof At Intersection And Junctions In Underground Coal Mines


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Bureau of Mines Research and Technologic Work on Coal, 1962


Bureau of Mines Research and Technologic Work on Coal, 1962

Author: United States. Bureau of Mines

language: en

Publisher:

Release Date: 1963


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Information Circular


Information Circular

Author:

language: en

Publisher:

Release Date: 1962


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